Expansion
Physics · प्रसार · 10 facts
1
Thermal expansion: substances expand on heating, contract on cooling
2
Solids: linear, superficial, cubical expansion
3
Railway tracks have gaps for summer expansion
4
Electric wires sag in summer, tighten in winter
5
Anomalous expansion: water expands cooling from 4C to 0C
6
Water max density at 4C; aquatic life survives in frozen lakes
7
Bimetallic strip: two metals bonded, bends on heating (thermostat)
8
Gases expand most; liquids more than solids for same temp rise
9
Hot glass cracks with cold water (uneven expansion)
10
Bridges use roller supports; roads have expansion joints